1. Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand
2. School of Electronic and Electrical Engineering, University of Leeds, Leeds, U.K.
3. School of Telecommunication Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand
4. Department of Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand
5. Aeronautical Electronics Engineering from Civil Aviation Training Center (CATC), Bangkok, Thailand